/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundDataFactory.h
typedef [TDataTypeVariantFallbackHelper](API\Plugins\MetasoundGraphCore\TDataTypeVariantFallbackHelper)< [DataType](API\Plugins\OptimusCore\DataType), FirstVariantType, AdditionalVariantTypes... > FFallbackHelper